[Mgs] list

[Paul Hunt]

But the 'million' refers to the final result.  Yes I agree that if you add a
dilution of 1300ppm to another dilution of 1300ppm, of the same product or
different it doesn't matter, you still have a dilution of 1300ppm, because you
now have double the quantity of final product you had before.  But if you take
a given quantity of a mixture of chemicals, each with its own ppm dilution,
they are each expressed as a proportion of the total mixture, so they must all
add up to a million parts per million in the final result.  Is that not so?

PaulH.
  ----- Original Message -----


  No, that is improper chemistry. 1300ppm zinc plus 1300ppm phosphorus
doesn't
  equal 2600ppm of the compound -- if they are in equal proportions, it would
  still be 1300ppm of ZDDP.